9986813 has 2 divisors, whose sum is σ = 9986814. Its totient is φ = 9986812.

The previous prime is 9986791. The next prime is 9986831. The reversal of 9986813 is 3186899.

Together with next prime (9986831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9966649 + 20164 = 3157^2 + 142^2 .

It is an emirp because it is prime and its reverse (3186899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9986813 - 2⁶ = 9986749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9986863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4993406 + 4993407.

It is an arithmetic number, because the mean of its divisors is an integer number (4993407).

Almost surely, 2^9986813 is an apocalyptic number.

It is an amenable number.

9986813 is a deficient number, since it is larger than the sum of its proper divisors (1).

9986813 is an equidigital number, since it uses as much as digits as its factorization.

9986813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 44.

The square root of 9986813 is about 3160.1919245514. The cubic root of 9986813 is about 215.3487255774.

The spelling of 9986813 in words is "nine million, nine hundred eighty-six thousand, eight hundred thirteen".